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1 (The nose and mouth make up the first part where air enters your body. 2  The trachea, or windpipe, is the second part and it delivers air to the lungs. 3  Your lungs are the third part where oxygen is absorbed by the blood, which brings it to the rest of the body. 4  Finally, the diaphragm is the fourth part.
That is how respiratory system works. The air can go through your nose and mouth. the nose can warm and filter the air but the mouth canât. After, the the air warms and filters the nose it goes into the trachea then leads to the bronchi. Next, air goes to this flat muscle called diaphragm.hat is how respiratory system works. The air can go through your nose and mouth. the nose can warm and filter the air but the mouth canât. After, the the air warms and filters the nose it goes into the trachea then leads to the bronchi. Next, air goes to this flat muscle called diaphragm.